Today’s Tuesday Travel is a list of places where you can get royalty free icons. Use them on your website (usually free, sometimes with attribution required). Check each one to make sure before you use them.
Icon Archive (thanks to Michael Martine for pointing this one out). Icons of all shapes and sizes, plus a really cool sliding search feature.
Free icons, from shiny to origami, and holidays
Chocolate obsession icon set (I think the name pretty much covers it!).